JP5402241B2 - Output control apparatus, image forming apparatus, and output control method - Google Patents

Description

  The present invention relates to an output control apparatus, an image forming apparatus, and an output control method that perform feedback control on an output amount of an output apparatus.

  Conventionally, in order to keep the power supply of devices such as power supply devices and motor drive devices constant, the duty such as PWM (Pulse Width Modulation) signal is measured, and the difference between the measured duty and the reference duty is obtained. The power of the various devices described above is feedback-controlled.

  As a technique for appropriately performing such feedback control, for example, Patent Document 1 discloses that when the voltage of the power supply device is large compared to the target value and when the voltage of the power supply device is small compared to the target value. A technique is disclosed in which the power supplied from the power supply device can be kept good by separately performing PWM control.

  However, in the technique of Patent Document 1, PWM control is performed based on the same reference when the voltage is larger than the target value and when the voltage is small. Therefore, for example, as shown in FIG. 8A and FIG. 8B, when the target value is “50”, the value of the PWM signal at the start of the feedback control (that is, when the feedback control is performed). The average value of the feedback-controlled PWM signal varies depending on the difference in the initial value (the initial value is “41” in the case of FIG. 8A and the initial value is “49” in the case of FIG. 8B). There was a problem that would occur. That is, there is a problem in that the output amount of the supplied power or the like varies depending on the difference in the initial value of the PWM signal.

  The present invention has been made in view of the above, and an output control device capable of providing an average constant output regardless of a difference in an initial value of an output amount output from a device to be subjected to feedback control, An object is to provide an image forming apparatus and an output control method.

  In order to solve the above-described problems and achieve the object, an output control device according to the present invention includes a first correction amount for correcting a first output amount output from a first device to be controlled. Storage means for storing a second correction amount different from the first correction amount for correcting the first output amount, control means for controlling the output of the first device, and the first When the first output amount output by one device is less than the first target value that is the target value of the first output amount, the second output that operates according to the first output amount Correcting the first output amount based on a second output amount output by the device, a second target value that is a target value of the second output amount, and the first correction amount; When the first output amount is equal to or greater than the first target value, the first output amount is set based on the second correction amount. Comprising a positive adjusting means, wherein the control means controls the output of the first device so as to output the corrected first output amount.

  The present invention also provides an output control method executed by the output control apparatus and an image forming apparatus including the output control apparatus.

  According to the present invention, when feedback control is performed so that the first output amount from the first device becomes the first target value, the first output amount is equal to or greater than the first target value. Feedback control of the first output amount by the first correction amount for correcting the output amount of the first output, and the first output amount for correcting the first output amount when the first output amount is less than the first target value. Since the feedback control of the first output amount by the second correction amount different from the correction amount of 1 is alternately repeated, regardless of the initial value of the output from the first device when starting the feedback control, There is an effect that the average value of the output from the first device can be kept constant.

  Further, according to the present invention, when the upper limit value of the first output amount is set, the first output amount from the first device and the first output amount are generated. Since feedback control is repeatedly performed using the second output amount, the first correction amount, and a second correction amount that is different from the first correction amount, an upper limit value of the first output amount that can be supplied is determined. Even if the first output amount can be feedback-controlled more precisely within the supplyable range, and the first output from the first device when the feedback control is started. Regardless of the initial value of the ability, there is an effect that the average value of the output from the first device can be kept constant.

FIG. 1 is a block diagram illustrating an example of a hardware configuration of the image forming apparatus according to the first embodiment. FIG. 2 is a block diagram illustrating a configuration of the output control apparatus according to the first embodiment. 3A and 3B are diagrams showing how the output control device shown in FIG. 2 feedback-controls the output of power (when the initial value is 41 W and the increase correction amount is large), and FIG. 3B is the output shown in FIG. It is a figure which shows a mode that a control apparatus feedback-controls the output of electric power (when an initial value is 49 W and an increase correction amount is large). 4A and 4B are diagrams illustrating a state in which the output control device illustrated in FIG. 2 performs feedback control of the power output (when the initial value is 49 W and the reduction correction amount is large), and FIG. 4B is the output illustrated in FIG. It is a figure which shows a mode that a control apparatus feedback-controls the output of electric power (when an initial value is 41 W and a reduction | decrease correction amount is large). FIG. 5 is a flowchart illustrating an execution procedure until the power output is feedback controlled in the output control apparatus according to the first embodiment. FIG. 6 is a block diagram illustrating a configuration of the output control apparatus according to the second embodiment. FIG. 7 is a flowchart illustrating an execution procedure until the power output is feedback-controlled in the output control apparatus according to the second embodiment. FIGS. 8A and 8B are diagrams showing how the power output is feedback-controlled by the prior art (when the initial value is 41 W), and FIG. 8B shows the power output feedback-controlled by the prior art. Yes (when the initial value is 49W).

  Exemplary embodiments of an output control device, an image forming apparatus, and an output control method according to the present invention are explained in detail below with reference to the accompanying drawings.

(First embodiment)
Hereinafter, a case where the present invention is applied to an image forming apparatus provided with an induction heating type fixing system will be described as an example. However, an applicable apparatus is not limited to this.

  FIG. 1 is a block diagram illustrating an example of a hardware configuration of the image forming apparatus 10 according to the first embodiment. As shown in FIG. 1, the image forming apparatus 10 includes a PSU (Power Supply Unit) 20, an IH inverter 30, a coil unit 40, a fixing unit 50, and an output control device 1000.

  The PSU 20 controls supply of power to each circuit of the image forming apparatus 10 based on AC power. For example, the PSU 20 generates a DC power source such as + 24V or + 5V necessary for each circuit of the image forming apparatus 10 from the input AC power source. The PSU 20 supplies the input AC power to the IH inverter 30 and a pressure heater (not shown) for heating the pressure roller 52 in the fixing unit 50 via a fixing relay or the like.

  The IH inverter 30 generates electric power for driving the main coil 41 in the coil unit 40 in accordance with a control signal sent from the output control device 1000. The IH inverter 30 includes a coil drive circuit 31 and a detection circuit 32.

  The coil drive circuit 31 functions as a power generation unit (an example of a first device) that generates electric power (an example of a first output amount) for driving the main coil in the coil unit 40. Specifically, the coil drive circuit 31 generates a coil current that flows through the main coil 41 in accordance with a control signal from the output control device 1000 based on the AC power supplied from the PSU 20 and drives the main coil 41.

  The detection circuit 32 includes a voltage detection circuit 32a and a current detection circuit 32b. The voltage detection circuit 32 a detects a voltage corresponding to the power output from the coil drive circuit 31. The current detection circuit 32 b detects a current (coil current) corresponding to the power output by the coil drive circuit 31. In the present embodiment, the voltage and current corresponding to the power output from the coil drive circuit 31 are detected by detecting the voltage and current corresponding to the power input to the IH inverter 30.

  The coil unit 40 includes various coils used in the induction heating method. The coil unit 40 includes a main coil 41, a cancel coil 42, and a thermopile 43.

  The main coil 41 is a coil for electromagnetically heating the fixing roller 51 of the fixing unit 50 with an eddy current. The main coil 41 generates a magnetic field when a coil current is applied by the coil drive circuit 31 of the IH inverter 30. The fixing roller 51 is heated by an eddy current flowing by the magnetic field generated in this way. That is, the fixing roller 51 functions as a second device that operates by the power generated by the coil drive circuit 31 (an example of the first output amount). The thermal energy generated by the fixing roller 51 corresponds to the second output amount.

  The cancel coil 42 is a coil that generates a magnetic field in a direction that cancels the magnetic field generated in the main coil 41.

  The thermopile 43 detects the temperature of the fixing roller 51. Note that other temperature detection means such as a thermistor may be used as long as the temperature can be detected.

  The fixing unit 50 includes a fixing roller 51 and a pressure roller 52, and fixes the toner image transferred to the recording paper by heat from the fixing roller 51 and pressure from the pressure roller 52.

  The fixing roller 51 is a roller for heating the recording paper on which the unfixed toner image is transferred. The fixing roller 51 is heated by electromagnetic induction by an eddy current that flows due to the magnetic field generated by the main coil 41.

  The pressure roller 52 is a roller that is biased with a predetermined pressure so as to face the fixing roller 51.

  The output control device 1000 controls the electric power that the IH inverter 30 outputs to the coil unit 40. In the present embodiment, the output control device 1000 controls the power output from the IH inverter 30 to be a target value by feeding back the detection result of the power by the detection circuit 32.

  The output control apparatus 1000 includes a memory 11 that stores various types of information necessary for control processing, and a CPU 12 that executes control processing. Hereinafter, the functional configuration of the output control apparatus 1000 will be described with reference to FIG.

  FIG. 2 is a block diagram illustrating a configuration of the output control apparatus 1000 according to the first embodiment. As shown in the figure, the output control apparatus 1000 includes a storage unit 100, an adjustment unit 200, a control unit 300, and a conversion unit 600. For example, the storage unit 100 corresponds to the memory 11 in FIG. Further, the adjustment unit 200, the control unit 300, and the conversion unit 600 correspond to functional units executed by the CPU 12 of FIG. Further, the output control device 1000 is connected to a power generation unit 400 corresponding to the coil drive circuit 31 of FIG. 1 and a detection unit 500 corresponding to the detection circuit of FIG.

  In the following description, the output control apparatus 1000 will be described as being incorporated in the multifunction peripheral, which is the image forming apparatus 10. However, any apparatus other than the multifunction peripheral can be used as long as it is a device that performs feedback control. It is also possible to do.

  The storage unit 100 includes a storage medium such as a memory. The storage unit 100 has a target value (hereinafter referred to as target power) of power output from the power generation unit 400 (hereinafter referred to as output power) and a reduction correction amount that is a correction amount for increasing or decreasing the output power. (Example of first correction amount) and increase correction amount (example of second correction amount) are stored. The reduction correction amount is a comparison between the target power and a feedback voltage (hereinafter referred to as a feedback signal) converted into a digital signal by the conversion unit 600, and when the output power is equal to or higher than the target power, Represents the PWM duty correction amount to make it less than the target power. The increase correction amount represents a PWM duty correction amount for making the output power equal to or higher than the target power when the output power is less than the target power.

  The increase correction amount and the decrease correction amount are different values (for example, when the target power is 50 W) so that the average value of power output from the power generation unit 400 (hereinafter referred to as average power) is constant. Is stored as an increase correction amount of 11% and a decrease correction amount of 10%. In this embodiment, when the correction amount is operated near the target power of 50 W, the power is changed by operating the increase correction amount to 11% and the power is changed by operating the decrease correction amount to 10%. An example is shown.

  The adjustment unit 200 compares the feedback signal converted from the voltage value in the conversion unit 600 with the target power stored in the storage unit 100, and determines whether or not the converted feedback signal is equal to or higher than the target power. judge. When the adjustment unit 200 determines that the converted feedback signal is equal to or higher than the target power, the adjustment unit 200 performs an operation such as reducing the reduction correction amount stored in the storage unit 100 with respect to the duty of the current PWM signal. To output a pulse signal to the control unit 300.

  Further, when the adjustment unit 200 compares the feedback signal converted from the voltage value with the target power and determines that the converted feedback signal is less than the target power, the adjustment unit 200 sets the duty of the current PWM signal. On the other hand, a calculation such as addition of the increase correction amount stored in the storage unit 100 is performed, and a pulse signal is output to the control unit 300.

  For example, as shown in FIG. 3A, the target power A is 50 W, the increase correction amount is 11%, the decrease correction amount is 10%, and the power output by the power generator 400 is from 0 W to the target power A. It is assumed that the output signal rises to 41 W in the vicinity (that is, the initial value of the output power when feedback control according to the present embodiment is started), and a feedback signal corresponding to 41 W is output from the conversion unit 600. In this case, the adjustment unit 200 reads the increase correction amount 11% stored in the storage unit 100, and is 11% that is the increase correction amount with respect to the duty of the current PWM signal (the value 41% in parentheses in the figure). A pulse signal is output so that 52% is added. That is, the corrected power value is 52W.

  Thereafter, the adjustment unit 200 reduces the duty of the corrected 52% PWM signal so that the power of 52 W adjusted by the control unit 300 is controlled to be less than the target power A according to the output feedback signal corresponding to 52 W. A pulse signal (42%) that reduces the correction amount 10% to 42 W is output.

  FIG. 3B shows the case where the target power A, the increase correction amount, and the decrease correction amount are the same as those in FIG. 3A, but the initial value of the output power is 49 W, which is different from that in FIG. It is a figure which shows the example of. In the example shown in FIG. 3B, the power value has a different transition from the transition of the power value shown in FIG. 3A due to the difference in the initial value. The power value is the same as shown in (a). Note that the power value at the right end of the period T is not used for calculating the average value in the period T. For example, in FIG. 3A, the power value 41W at the left end of the period T is used for calculating the average value, but the power value 41W at the right end is not used for calculating the average value. In this way, by repeatedly performing the correction by the increase correction amount and the correction by the decrease correction amount different from the increase correction amount, the average value of the power output by the power generation unit 400 in a certain period T is It can be constant regardless of the initial value.

  In the following description, the increase correction amount is described as being larger than the decrease correction amount. However, as shown in FIGS. 4A and 4B, the increase correction amount is greater. Is smaller than the decrease correction amount (for example, increase correction amount: 10%, decrease correction amount: 11%).

  The control unit 300 includes a conversion circuit for PWM conversion, converts the pulse signal output from the adjustment unit 200 into a PWM signal, and outputs the PWM signal to the power generation unit 400.

  The power generation unit 400 generates power corresponding to the duty of the PWM signal output from the control unit 300.

  The detection unit 500 includes a conversion circuit for converting power into voltage, detects the power generated by the power generation unit 400, converts the detected power into a voltage value, and converts the voltage into the conversion unit 600. Output the value.

  The conversion unit 600 includes a converter such as an A / D converter, converts the voltage value output from the detection unit 500 into a feedback signal, and outputs the feedback signal to the adjustment unit 200.

  Next, execution processing performed by the output control apparatus 1000 will be described.

  FIG. 5 illustrates a process in which the output control apparatus 1000 performs feedback control to keep the output power constant when receiving an instruction to execute an application such as a printing process from an operation panel (not shown) of the multifunction device. It is a flowchart which shows the procedure in the case of doing. In the following description, in the multi-function peripheral including the output control device 1000, after the power is turned on, the power generator 400 causes the power near the target value (for example, the power of 41 W, which is the initial value shown in FIG. 4). ) And the conversion unit 600 is in a state where the voltage value converted from the power is converted into a feedback signal and output to the adjustment unit 200.

  As shown in the figure, when the feedback signal converted by the conversion unit 600 is output to the adjustment unit 200, the adjustment unit 200 acquires a target value stored in the storage unit 100 (step S501). The adjustment unit 200 compares the acquired target value with the voltage value of the output feedback signal, and determines whether or not the voltage value of the feedback signal is equal to or higher than the voltage value that is the target power (step S502). .

  Then, when it is determined that the voltage value of the feedback signal is equal to or higher than the voltage value that is the target power (step S502; Yes), the adjustment unit 200 calculates the reduction correction amount stored in the storage unit 100 from the voltage value of the feedback signal. By subtracting, a pulse signal for generating a PWM signal with a duty such that the power output from the power generation unit 400 is less than the voltage value that is the target power is output (step S504).

  On the other hand, when it is determined that the voltage value of the feedback signal is less than the voltage value that is the target power (step S502; No), the adjustment unit 200 adds the amount of increase correction stored in the storage unit 100 to the voltage value of the feedback signal. In addition, a pulse signal for generating a PWM signal with a duty such that the power output from the power generation unit 400 is equal to or higher than the voltage value serving as the target power is output (step S503).

  The control unit 300 converts the pulse signal output in step S503 or step S504 into a PWM signal and outputs the PWM signal to the power generation unit 400 (step S505). Thereafter, the power generation unit 400 generates power according to the output PWM signal, the detection unit 500 detects the output power and converts it into a voltage value, and the conversion unit 600 further converts the converted voltage value. A feedback signal is converted and output to the adjustment unit 200.

  As described above, when feedback control is performed so that the output power from the power generation unit 400 becomes the target power, when the output power is equal to or higher than the target power, the reduction power is subtracted from the output power to reduce the power below the target power. Feedback control is performed so that Further, when the output power is less than the target power, the feedback control is repeated so that an increase correction amount having a value different from the decrease correction amount is added to the output power so that the power becomes equal to or higher than the target power. Thereby, irrespective of the initial value of the output power from the power generation unit 400 when starting the feedback control, the average value of the output power from the power generation unit 400 can be kept constant. That is, as shown in FIGS. 3 (a), 3 (b), 4 (a), and 4 (b), the feedback control of the present embodiment repeats power fluctuations in the same pattern. The average power in the cycle can be constant (target power) regardless of the initial power value.

(Second Embodiment)
In the first embodiment, the correction amount varies depending on whether the output power is larger or smaller than the target power in order to keep the average value of the power output by the power generation unit 400 of the output control apparatus 1000 constant. It was decided to perform feedback control using. However, there is a case where power that can be supplied is determined in advance, and feedback control needs to be performed within the range of power that can be supplied. In addition, for example, there is a case where it is desired to feedback control the output power more precisely based on the output power and the temperature of thermal energy generated when the power is output. Therefore, in the second embodiment, a case will be described in which feedback control of output power is performed more precisely according to power and temperature in such a case.

  In the second embodiment, the functional configuration of the output control apparatus is different from that of the first embodiment. However, the hardware configuration of the image forming apparatus 10 is the same as that in FIG. Hereinafter, the functional configuration of the output control apparatus 2000 according to the second embodiment will be described with reference to FIG.

  FIG. 6 is a block diagram illustrating a configuration of the output control apparatus 2000 according to the second embodiment. The output control apparatus 2000 according to the second embodiment includes a storage unit 110 that is different from the storage unit 100 in the first embodiment, an adjustment unit 210 that is different from the adjustment unit 200 in the first embodiment, and It differs from the output control apparatus 1000 concerning 1st Embodiment by the point provided with the conversion part 610 different from the conversion part 600 in 1st Embodiment. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The storage unit 110 corresponds to the memory 11 in FIG. Further, the adjustment unit 210, the control unit 300, and the conversion unit 610 correspond to functional units executed by the CPU 12 of FIG. The output control device 2000 includes a power generation unit 400 corresponding to the coil drive circuit 31 in FIG. 1, a first detection unit 510 corresponding to the detection circuit 32 in FIG. 1, and a heater corresponding to the fixing roller 51 in FIG. The unit 710 is connected to a second detection unit 720 corresponding to the thermopile 43 in FIG.

  The storage unit 110 stores the same content as the content stored in the storage unit 100 in the first embodiment, and also the target value of the temperature of the heat energy output by the heater unit 710 (hereinafter referred to as the target temperature). And a proportional coefficient (hereinafter simply referred to as a proportional coefficient) and a differential coefficient (hereinafter simply referred to as a differential coefficient), which are coefficients for feedback control of the temperature of the thermal energy output by the heater unit 710 to the target temperature. Is remembered.

In addition, the storage unit 110 stores a formula for calculating a new PWM duty by feeding back the output power and the temperature of the thermal energy output by the heater unit 710. Specifically, when the adjustment unit 210 determines that the voltage value of the feedback signal output by the conversion unit 610 is less than the target value, the storage unit 110 outputs the target temperature and the temperature output by the heater unit 710. (The temperature at which the current voltage value is determined (hereinafter referred to as the current temperature) and the temperature at which the latest past voltage value is determined (hereinafter referred to as the previous temperature)) The following equation (1) for correcting the PWM duty when determined to be less than the target value is stored.
PD _new = PD _now + T ′ × K _p − (T _n −T _p ) × K _d (1)

In the formula (1), when PD _new is determined that the output power is less than the target value, PWM duty newly obtained by calculation, PD _now is PWM duty currently output, and T ′ is It is the difference between the target temperature and the current temperature (target temperature-current temperature). K _p is a proportional coefficient, K _d is a differential coefficient, T _n is a current temperature, and T _p is a previous temperature.

  In the following description, it is assumed that feedback control (so-called PD control) is performed according to an equation using a proportional coefficient and a differential coefficient as a coefficient for feedback control of the thermal energy output from the heater unit 710. The feedback control method is not limited to this. For example, feedback control (for example, PI control) may be performed using another coefficient such as an integral coefficient instead of the differential coefficient.

  The adjustment unit 210 performs the same processing as the adjustment unit 200 in the first embodiment, and the storage unit 110 stores the above-described voltage value of the feedback signal output from the conversion unit 610 when the voltage value is less than the target value. According to the equation (1), the PWM duty is adjusted.

  Further, the adjustment unit 210 determines whether or not the calculated voltage value is equal to or greater than a value obtained by adding the increase correction amount stored in the storage unit 110 to the voltage value of the feedback signal output from the conversion unit 610. . When the adjustment unit 210 determines that the calculated PWM duty is less than the current output PWM duty plus the increase correction amount stored in the storage unit 110, the adjustment unit 210 uses the calculated voltage value. A pulse signal for generating a duty PWM signal is output.

  On the other hand, when the adjustment unit 210 determines that the calculated PWM duty is equal to or greater than the currently output PWM duty plus the amount of increase correction stored in the storage unit 110, the adjustment unit 210 is currently output. A pulse signal for generating a PWM signal with a duty is output with a value obtained by adding the increase correction amount stored in the storage unit 110 to the PWM duty.

  The first detection unit 510 includes a large voltage detection unit 512 corresponding to the voltage detection circuit 32a in FIG. 1 and a large current detection unit 514 corresponding to the current detection circuit 32b in FIG.

  The large voltage detection unit 512 uses a voltage (hereinafter referred to as a high voltage) corresponding to the power output from the power generation unit 400 as a voltage (hereinafter referred to as a first small voltage) for generating a feedback signal. Convert.

  The large current detection unit 514 uses a current (hereinafter referred to as a large current) corresponding to the power output from the power generation unit 400 as a voltage (hereinafter referred to as a second small voltage) for generating a feedback signal. Convert.

  The heater unit 710 is a device that receives power supplied from the power generation unit 400, converts the power into heat energy, and outputs the heat energy to a device to be controlled (for example, a fixing device). .

  The second detection unit 720 converts the temperature generated with the thermal energy output from the heater unit 710 into a voltage (hereinafter referred to as a third small voltage) for generating a feedback signal. Then, the converted first small voltage, second small voltage, and third small voltage are input to the conversion unit 610 and a feedback signal is output.

  Subsequently, an execution process performed by the output control apparatus 2000 according to the second embodiment will be described with reference to FIG. The output control device 2000 according to the second embodiment differs from the processing in the output control device 1000 according to the first embodiment only in the processing for the part that controls the output power by temperature. Therefore, the description of the same processing (steps S601 to S603 and S608) as the processing according to the first embodiment is omitted.

  When the adjustment unit 210 determines that the voltage value of the feedback signal is less than the voltage value that is the target power (step S602; No), the adjustment unit 210 further acquires the target temperature from the storage unit 110 (step S604). .

  Then, the adjustment unit 210 performs an operation according to the equation (equation (1)) stored in the storage unit 110 in order to correct the currently output PWM duty of the feedback signal output from the conversion unit 610, and performs a new operation. The PWM duty is obtained (step S605).

  Further, the adjustment unit 210 determines whether or not the PWM duty calculated in step S605 is equal to or greater than a value obtained by adding the increase correction amount stored in the storage unit 110 to the currently output PWM duty (step S606). ).

  If it is determined that the PWM duty calculated in step S605 is equal to or greater than the current output PWM duty plus the stored increase correction amount (step S606; Yes), the currently output PWM duty A pulse signal for generating a PWM signal having a duty value obtained by adding the increase correction amount stored in the storage unit 110 is output (step S607).

  On the other hand, when it is determined that the calculated PWM duty is less than the current output PWM duty plus the increase correction amount stored in the storage unit 110 (step S606; No), the calculation is performed in step S605. A pulse signal for generating a duty PWM signal is output (step S608). Thereafter, the control unit 300 converts the pulse signal output in steps S607 and S608 into a PWM signal (step S609).

  As described above, in the second embodiment, when the power that can be supplied cannot be exceeded, the output power is feedback-controlled by the output power and the temperature of the thermal energy generated when the power is output. . Thereby, even when the upper limit value of the power that can be supplied is determined, the output power can be more precisely feedback-controlled within the supplyable range. Further, the average value of the output power from the power generation unit 400 can be kept constant regardless of the initial value of the output power from the power generation unit 400 when starting the feedback control. In particular, when the output control device 2000 is applied to a multi-function peripheral, the temperature control is performed in addition to the power control, so that the toner can be fixed quickly or the quality of the processed image can be made uniform. Can keep.

  In each of the above-described embodiments, the output to be controlled is described as being electric power or temperature, but the output to be controlled may be feedback controlled as being, for example, brightness or speed. By such a device, it is possible to apply feedback control similar to that of the present embodiment to various devices as well as the multi-function device.

  Note that programs executed by the output control apparatuses 1000 and 2000 according to the present embodiment are provided by being incorporated in advance in a ROM or the like. The programs executed by the output control apparatuses 1000 and 2000 according to the present embodiment are files that can be installed or executed, and are CD-ROM, flexible disk (FD), CD-R, DVD (Digital Versatile Disk). For example, the program may be recorded on a computer-readable recording medium.

  Further, the program executed by the output control apparatuses 1000 and 2000 according to the present embodiment may be configured to be provided by being stored on a computer connected to a network such as the Internet and downloaded via the network. . Further, the program executed by the output control apparatuses 1000 and 2000 according to the present embodiment may be configured to be provided or distributed via a network such as the Internet.

  The program executed by the output control apparatuses 1000 and 2000 according to the present embodiment has a module configuration including the above-described units (adjustment unit, control unit, conversion unit, etc.), and CPU (processor) is the actual hardware. ) Reads out the program from the ROM and executes it, so that the respective units are loaded onto the main storage device, and the respective units are generated on the main storage device.

  In the above-described embodiment, the example in which the output control device is applied to the multifunction device has been described. However, the present invention is not limited to the multifunction device, and can be applied to various devices including a copying machine, a facsimile, and a printer. be able to.

  Further effects and modifications can be easily derived by those skilled in the art. The embodiments of the present invention are not limited to the specific embodiments as described above. Therefore, various modifications can be made without departing from the concept of the invention of the appended claims and equivalents thereof.

  As described above, the output control device, the image forming apparatus, and the output control method according to the present invention are useful when performing feedback control processing, and particularly feedback when the initial value of the output amount to be controlled fluctuates. Suitable for control technology.

DESCRIPTION OF SYMBOLS 100 Memory | storage part 200 210 Adjustment part 300 Control conversion part 400 Electric power generation part 500 Detection part 510 1st detection part 512 Large voltage detection part 514 Large current detection part 600 610 Conversion part 710 Heater part 720 2nd detection part 1000 2000 Output control apparatus

Japanese Patent Laid-Open No. 07-203672

Claims (12)

The first correction amount for correcting the first output amount output from the first device to be controlled is different from the first correction amount for correcting the first output amount. Storage means for storing the correction amount of
Control means for controlling the output of the first device;
When the first output amount output by the first device is less than a first target value that is a target value of the first output amount, the first output amount that operates according to the first output amount. The first output amount is corrected based on the second output amount output by the second device, the second target value that is the target value of the second output amount, and the first correction amount. Adjusting means for correcting the first output amount based on the second correction amount when the first output amount is equal to or greater than the first target value;
The output control device, wherein the control means controls the output of the first device so as to output the corrected first output amount.   The adjusting means further corrects from the second output amount, the second target value, and the first correction amount when the first output amount is less than the first target value. The first output amount is calculated, and the calculated first output amount is equal to or greater than an output correction value obtained by adding the first correction amount to the first output amount output by the first device. In the case of the above, the first output amount is corrected to the output correction value, and when the calculated first output amount is less than the output correction value, the first output amount is calculated. The output control apparatus according to claim 1, wherein the first output amount is corrected. The storage means stores the first correction amount and the second correction amount for correcting the duty of a PWM (Pulse Width Modulation) signal,
The output control apparatus according to claim 1, wherein the control unit controls an output of the first device by a PWM signal. The first device is a device that generates electric power,
The output control apparatus of any one of Claims 1-3. The second device is a device that generates thermal energy,
The output control apparatus of any one of Claims 1-4. The first output amount is the electric power, and the second output amount is a temperature generated with the thermal energy.
The output control device according to claim 5. The device that generates electric power is a motor,
The output control device according to claim 5. Heating means for heating the heating member of the fixing unit for fixing the toner image transferred to the recording medium in response to power supply;
Power generating means for generating power to be supplied to the heating means;
Storage means for storing a first correction amount for correcting the power output by the power generation means, and a second correction amount different from the first correction amount for correcting the power;
Control means for controlling the output of the power generating means;
When the power output by the power generation means is less than the target value of the power, the power is corrected based on the first correction amount, and when the power is equal to or greater than the target value. Comprises adjusting means for correcting the power based on the second correction amount,
The image forming apparatus, wherein the control unit controls the output of the power generation unit so as to output the corrected power.   When the electric power output by the electric power generation means is less than a target value of the electric power, the adjusting means, the temperature of the heating member, the target value of the temperature of the heating member, and the first The power is corrected based on a correction amount, and the power is corrected based on the second correction amount when the power is greater than or equal to a target value of the power. The image forming apparatus described.   The adjusting means further adjusts the corrected power from the temperature of the heating member, the target value of the temperature of the heating member, and the first correction amount when the power is less than the target value of the power. When the calculated power is equal to or greater than an output correction value obtained by adding the first correction amount to the power output by the power generation means, the power is corrected to the output correction value, The image forming apparatus according to claim 9, wherein when the calculated power is less than the output correction value, the power is corrected to the calculated power. The storage means stores the first correction amount and the second correction amount for correcting the duty of the PWM signal,
The image forming apparatus according to claim 8, wherein the control unit controls an output of the first device by a PWM signal. The first correction amount for correcting the first output amount output from the first device to be controlled is different from the first correction amount for correcting the first output amount. An output control method executed in an output control device comprising a storage means for storing the correction amount of
A control means for controlling an output of the first device;
When the adjusting means has the first output amount output by the first device less than the first target value, which is a target value of the first output amount, the first output amount. The first output based on the second output amount output from the second device that operates according to the force amount, the second target value that is the target value of the second output amount, and the first correction amount. An adjustment step of correcting an output amount, and correcting the first output amount based on the second correction amount when the first output amount is equal to or greater than the first target value;
A second control step, wherein the control means controls the output of the first device so as to output the corrected first output amount;
The output control method characterized by including.

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